Dr. Subhasis Roy
Design, Synthesis and Characterization of Functionalized Nanomaterials for Smart Energy Systems
Dr. Subhasis Roy is an Assistant Professor, Department of Chemical Engineering, University of Calcutta, India since 2013. He was a visiting researcher postdoctoral Raman Fellow at Ohio University, USA. Dr. Roy received his PhD in Materials Science from Indian Institute of Technology, Kharagpur, India in 2012. Before joining as a faculty member in Calcutta University, he worked as a Postdoctoral Researcher in Sungkyunkwan University, South Korea and also as Research Scientist in IISER, Kolkata, India. He has more than 50 publications, including 32 scientific research papers on peer-reviewed journals and conference proceedings and 5 inviting talks. He has two book chapters to his credit. Dr. Roy has achieved many awards like prestigious UGC-Raman Post-Doctoral Fellowship, DST India, Fast Track Young Scientist Start-Up Research Grant from Science and Engineering Research Board, Department of Science and Technology (SERB –DST) India, Venus International Research Awards (VIRA) 2016 as an Outstanding Scientist for Initiatives, Discoveries, and Developments in the discipline of Nanoscience and Nanotechnology and Honorable Jury,South Asian Education Awards, 2018 and Teachers Associateship for Research Excellence (TARE) by the Science and Engineering Research Board, 2018 Institute of Scholars, InSc Best Teachers award 2019 for recognize of valuable contribution to the academic community and the students, Best Faculty Award (Male) by International Academic and Research Excellence Awards (IARE-2019). He was also awarded as a recognized Reviewer status in Construction and Building Materials (Elsevier), Material Science Research India (MSRI), Journal of Engineering Research & Technology (IJERT). He is an editorial board member of 28 peer-reviewed international journals and reviewer for 35 international journals. He is a member of Royal Society of Chemistry London, the National Academy of Sciences, India and many other professional societies (more than 24). Presently, Dr. Roy involved conducting research in the chosen area of specialization, guiding PhD, M. Tech. Students and teaching at undergraduate and postgraduate level. He has expertise on perovskite Solar Cells, Multiferroic composite thin films, Photocatalyst for Water Splitting, Fuel Cell and Hydrogen energy.
New multifunctional materials are needed for the development of novel smart energy systems. In this field single as well as composite nanomaterials attracted significant interests for both academic and industrial research. Optimization of the structure-property-processing relationship of composite nanostructured materials under different conditions is important towards exploring potential applications. This talk will provide full details on synthesis, characterization and application of a series of nanomaterials and its application in clean energy generation. For hydrogen production using a photoelectrochemical (PEC) route promises to be a clean and efficient way of storing solar energy for use in hydrogen-powered fuel cells. Iron oxide is best suited to be used as a photoelectrode in PEC cells for solar hydrogen production due to its favorable band gap of 2.2 eV. For this reason nanocrystalline TiO2 and Fe2O3 metal oxide films have been intensively received scientific attention during the last decade as a promising new generation photocatalysts and photovoltaics materials and also for their low-cost manufacturing process, stability and high energy conversion efficiency. However, these can only be initiated under ultraviolet light irradiation owing to its wide bandgap, weak separation efficiency of carriers and high recombination. Doping is an effective method to extend the light absorption to the visible light region. In this paper, general plans are anticipated by passivated cobalt-doping to enhance the activity of Fe2O3/TiO2 semiconductors for photocatalysis and photovoltaics applications. Our result showed that the ideal band gap of Fe2O3 semiconductors can be pull down by doping to match with visible light absorption and the conduction band (CB) position can also be raised to meet the reducing capacity. The photocatalytic activity of this cobalt doped Fe2O3/TiO2 nanocomposites was optimized by visible light-driven photo-catalytic degradation of aqueous methyl orange. This optimized cobalt doped Fe2O3 film was used to fabricate MaPbI3 perovskite sensitized solar cells. The output power–voltage characteristics indicate that the output power of the solar cell improves significantly. Such cell achieved efficiency around 4.3 % for the active area 0.8 cm2. In case of perovskite solar cell, we worked on controlled processing of nanostructured films for environment friendly renewable energy sources. In this case, we successfully synthesized nanocrystal by hydrothermal process. Structure and morphology of all hybrid nanoparticles were characterized using a range of techniques such as X-ray diffraction, electron microscope, optical spectroscopic measurements. Attempt has been made to improve the efficiency of the solar cell by the change of fabrication process and optimizing nanostructural materials addition.
Thin film, nanomaterials , optimization, characterization, photoelectrochemical